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AssigneeThe United States of America as represented by the United States Department of Energy
InventorsMatesh N. Varma, John W. Baum
Estimating the term…
Charged particle beam monitoring means (40) are disposed in the path of a charged particle beam (44) in an experimental device (10). The monitoring means comprise a beam monitoring component (42) which is operable to prevent passage of a portion of beam (44), while concomitantly permitting passage of another portion thereof (46) for incidence in an experimental chamber (18), and providing a signal (I.sub.m) indicative of the intensity of the beam portion which is not passed. Calibration means (36) are disposed in the experimental chamber in the path of the said another beam portion and are operable to provide a signal (I.sub.f) indicative of the intensity thereof. Means (41 and 43) are provided to determine the ratio (R) between said signals whereby, after suitable calibration, the calibration means may be removed from the experimental chamber and the intensity of the said another beam portion determined by monitoring of the monitoring means signal, per se.
Apparatus comprising means for monitoring the intensity of charged particle beams, said beam intensity monitoring means being disposable in the path of such a charged particle beam, said beam monitoring means including means for preventing the passage of a constant cross-sectional portion of such charged particle beam through said beam monitoring means and for concomitantly permitting the passage of the remaining cross-sectional portion of the charged particle beam through said beam monitoring means without change, said beam monitoring means also including means for providing a signal which is indicative of the intensity of the charged particle beam cross-sectional portion which is prevented from passing therethrough;
A method for monitoring the intensities of charged particle beams comprising the steps of, preventing the passage of a cross-sectional portion of a charged particle beam through beam intensity monitoring means, concomitantly permitting the passage of another cross-sectional portion of such charged particle beam through said beam intensity monitoring means, and concomitantly providing a signal indicative of the intensity of said charged particle beam cross-sectional portion which is prevented from passing through said beam intensity monitoring means whereby, the provision of a signal indicative of the intensity of said charged particle beam cross-sectional portion which is permitted to pass through said beam monitoring means and the determination of the ratio of that signal to the signal provided by said beam monitoring means over a predetermined range of charged particle beam intensities will enable the subsequent determination of the intensity of the charged particle beam cross-sectional portion which is permitted to pass through the beam intensity monitoring means by determination of said beam intensity monitoring means signal.
Dependencies are inferred from the claim text.